Adjustable pneumatic spring



July 10,1928. 1,676,350

- 5. QUISLING ADJUSTABLE PNEUMATIC SPRING Filed May 2, 1924 Q Jfigi 1 v *Jverre Quisling 'INVENTOR W'TNESSA ATTO NEY Patented July 10, 1928.

UNITED STATES SVERRE QUISLING, OF PHILADELPHIA, PENNSYLVANIA.

ADJUSTABLE PNEUMATIC SPRING.

Application filed May 2, 1924. Serial No. 710,653.-

r This invention comprehends the provision of an instrument or .device for yieldable elastic uses, the strength of the elasticity of which is adjustable. The principle of Boyles law for gases is utilized in the construction of the device, that is, the prin ciple of Boyles law which includes The volume of a gas varies inversely as the pressure upon it and for the same density the density of a gas is directly proportional to the pressure acting upon it. Thus, by varying the density of a gas in a closed chamber by a pull applied to a. piston regulating the size of a chamber, there will be an opposite force due to atmospheric pressure, the said force acting. to bring the density of the gas within the chamber back i to its former volume.

More specifically stated the present invention includes a gas chamber with means for admitting desired amounts of gas thereinto and means for variation of the size of said chamber by a second part or parts such as a piston fitting snugly into the first-part or chamber, means for attaching the parts thus assembled to any desired object or objects, so that when'tension is applied, the elastic counter-force results. of the elastictension may be varied by varying the amount of gas in the chamber.

Other objects of the invention will apcylindrical body 1. A gasket 3 is provided.

which provides fluid-tight connection between part'of the body 1 and the cap. The

cap 2mayhave an eyelet 4 many other" desired construction of attaching member formed thereon to permit its-attachment to any suitable object. A piston 5 is mounted for reciprocatory movement within the cylinder 1 and has fluid tight engagement with the'inner wall of the cylinder. Depending The intensity diametrically oppositely disposed arms 6 are formed on the lower end of the piston 5and have a substantially'U-shaped attaching rod 7 having its ends bent in opposed relation with respect to each other and connected to the arms 6 adjacent their lower ends to permit attachment to a' suitable ob ject so as toprovide a spring or cushioning connection between objects connected to the eyelet 4 and the rod 7 In the operation 'of the device, the gas within the gas chamber 8 "is rarified by descent or-outward movement of the piston 5, resulting in lower inside.pressure, which will cause a counter-pressure against the piston 5by atmospheric pressure, thus acting as an elastic force. By unscrewing the can 2, and varying the amount of gas in the chamber, the density of the gas for the same Y volume will vary with correspondingly. varynig pressure and elastic tension.

The lmproved ad ustable pneumatic spring may be utilized for any other purpose in which springs of present constructions are utilized or Where it is desired, to

elastically support, an object or connection, a plurality of objects.

It is, of course, to be understood, that the invention may be constructed in variousv other manners and the parts associated in,

different relations, and therefore, I do notv desire to be limited in any manner, eXcept' as set forth in the claim hereunto ap pended.

l/Vhat I claim is:

. A pneumatic spring device comprising a body portion of cylindrical formation, a

cap threadedly secured to the top of said body portion, a gasket between the cap and fluid-tight connection,'a piston movable in top edge of the body portion to form a said body portion, an eyelet rising from the top of. the cap for fastening an object thereto, diametrically oppositely disposed arms depending from the lower end of the cylinder, and asubstantially U-shapedrod having its ends bent in opposed relation with respect to each other and secured to the arms adjacent their lower ends. 7

In testimony whereof I aflix my signature.

- SVERREQUISLING. 

